source:other news release time:2023-08-01 Hits: Popular:led screen wholesaler
Inductive boost and charge pump boost are two different topology modes.
Due to the fact that LEDs are driven by current, and the inductance has the highest efficiency in current conversion, the biggest advantage of the inductance boost method is its high efficiency. If designed properly, it can exceed 90%;
The disadvantage is that electromagnetic interference is very strong, and the system requirements for communication products such as mobile phones are very high.
With the emergence of charge pumps, the efficiency of using charge pump boosting method will be lower than that of inductive boosting.
The problems that product designers must face; Improve the conversion efficiency of the driving circuit.
It is beneficial for extending the standby time of portable products and solving the problem of LED heat dissipation, especially in the lighting field where high-power LEDs are used
1) LED requires components that stabilize current and voltage during operation; It should have the characteristics of high voltage sharing and low power consumption, otherwise the high efficiency LED will greatly reduce the overall system efficiency due to the high power consumption of the driving circuit.
2) Try not to use resistors or series voltage stabilizing circuits as the current limiting main circuit of LED drivers as much as possible; The use of efficient circuits such as capacitors, inductors, or active switching circuits can ensure the high efficiency of LED systems.
By using a series integrated constant power output circuit, the light output of LED can be kept constant over a wide power range, but the efficiency of general IC circuits may decrease as a result. The use of active switching circuits can ensure constant power output when the power supply voltage changes significantly with high conversion efficiency.
However, with its unique advantages, it can work efficiently under safe and specific voltage conditions (such as underwater lighting fixtures in swimming pools, paddling pools, and miner's lights). In addition, it also has unique advantages in directly using green electricity (solar, wind, etc.) and emergency lighting. Especially in terms of dimming, LED can not only achieve 0~100% dimming, but also ensure high light efficiency during the whole dimming process without damaging the life of LED, which is difficult for Gas-discharge lamp.
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